Countersunk suction roll shell



w. H. MILLSPAUGH. ,7 0 CQUNTERSUNK SUCTION ROLL SHEILA 7 May 19, 1931.

,Filed Dec. 13, 1926 3 Sheets-Sheet 2 INVENTOR WILLIRM H. Mmannuau h y M4 19M I ATLYFORNEV y 1931- w. H. MIILLSPAUGH 1,805,780

COUN TERSUNK SUCTION ROLL SHELL Filed Dec. 13, 1926 5 Sheets-Sheet 3/NVEN Tor: MLLmm H. MLLLSPFIIUGH,

'Bv M a 6M ATTOENEY Patented May 19, 1931 w'rttimn. .mmnsrauen,orsa'nnusn. onrogn'ssienon'romnn PAPER'& TEXTILE MACHINERY COMPANY, orsam csxn, 0310, A conrona'rxonor onto Applicationflled December is, 192a- Serial a. 154,363.

The present invention relates to suction devices, and more especially tomeans for increasing the operative area in suction roll shells andplates of the general type comgmonly used inthe paper making industry.

Heretofore it has been common practice,

especially in the making of' suction roll shells or' similarelements foruse in paper making, to drill cylindrical holes through In the wallthereof, of such size and number as to make of the shell, for instance,a cylindrical screen, the diameters of the holes or perforations varyingaccordin to the particular circumstances under w ich the shell or otherelement was to be used. In such shells, or the like, the practice, up tothe present time, has been to maintain the same diameter throughout thelength of each of the perforations, for press roll shells so or thelike, and to concentricall countersink the outer ends, circularly, orsuction couch roll shells or the like. The remaining imperforate surfacehad a somewhat lace-like formation or appearance, the portions extendingfrom one perforation to another and lying between them being reguiarlyshaped, each with a plurality of curved notches or indentations betweenwhich extended necks or strips merging with and connecting adjacentsimilar portions. This regular or lace-like imperforate portion servesto support the wireor other pulp carrying medium which travels on thecylinders throughout the suction operation. With such rolls, the amountof supporting surface for the pulp carrying medium (imperforate portion)is umiecessarily large and the available suction or operative formingsurface correspondingly reduced-a waste or, excess of'supporting surfaceand a loss or insufficiency of sue- 4, looking in the direction'of thearrows;

tion area.

- The main objects of the present invention are to so construct asuction roll, plate, or like suction element or device, as to avoid tothe greatest possible extent both of these objections and, whiledecreasing to the minimum the necessary bearing, supporting, 60 or barsurface, at the sametime increasing to-the maximum the effective,suction or vacuum forming area. In this way, the

totalefi'ective' area of the countersunk perforations will approachas'nearly as we ticable the totalarea of. that section. 0 the pulpsupporting medium lying: or extending directly across the. open oroperative side of the-suction box immediately underlying the adjacentperforate surface.

In order to more graphically disclose the construction and operation ofthe invention, comparative drawings are herewith presented showingsimilar fragmentary views of a common and well known con-. struction andof the construction embodying this invention. For ready comparison, thedrawings illustrate the old construction and the invention in but one ofmany uses --that of suction roll or cylinder for paper making machines.To more clearly understand the construction, operation, and useof theinvention, reference is made to said drawings, forming part of thepresent application.

In the drawings:

Fig. 1 is a side elevation ofv a suction roll of the old construction,partly broken away;

unpunched;

Fig. 2 is a cross section on line 2-2 of Fig. '1, looking in thedirection of the arrows;

Fig. 6 1s a plan view of the rib construction between the countersinksof Fig. 4, with perforations and countersinks omitted;

Figs. 78-9 and '10 areviews similar to Fig. 45, showing differentdesigns of countersinks and several different arrangements of suchdifierentdesigns;

- below, the sur -a modification with taper bore and Fig. 12 is a crosssection on line 12-1 of Fig. 11, looking in the direction of the arrows.

While the invention has been shown as applied to suction rolls orcylinders for pa- ,per making machines, it is obvious that it may beused effectively and operated in the same way, with fiat orsubstantially fiat plates, as in the rectangular suction chamers of theusual suction boxes of Fourdrinier machines; thatit may be used in manyother ways than that of paper making,in filters for instance. It is ofcourse not intended to limit the use of the invention by any statementherein made. It is intended to protect it in all uses to which it may beut, the single instance of a well known an general use being selected asone readily recognized and as merely illustration, in order to readilyconvey a clear and correct understanding of the invention.

In aper making, the best results are obtaine when the suctioin appliedto the pulp layer is uniformly or evenly distributed over the entiresurface exposed above the suction chamber, or as nearly sofas possible.Clearly, the old construction was inadequate in this respect. On theother hand, the forming or'supporting wire on which the aper sheet ismade, must have adequate an even support on the surface through whichthe suction is effective. For best results, such support should beregular, even and uniform, relativel to the 0 enings through which thesuction takes e ect. If the bar surface or area is not sufiicient thepulp car rying or supporting medium, under the action ofsuctionf willtend to collapse or sink cientsupport. Wherever, it sinks in thismanner, 'the effective suction area is correspondingly decreased, thecorresponding portion of the supporting member is distorted; and a verydestructive rubbing or friction action takes place, with resulting wasteof power and wearing or cutting of the supporting medium. fAlso, ofcourse,

tion area without adding to essential support of the pulp supportingmedium. Therefore, the most efiicient construction is that having amaximum effective suction area combined with a'minimum essentialeffective bar surface or area for adequately supporting the pulpcarrying medium as it moves over the perforated surface during theaction of the suction or vacuum. The present ace at the points ofinsufli v invention has been designed, more particularly, to accomplishthese results.

In describing the invention in detail, the form and arrangementdisclosed in Figs. 1-6 inclusive, of the drawings will be dealt with,the other designs and arrangements being treated separately. Referringto Figs.

1-6, the operative wall 1 of the shell, plate or like element, isdrilled in any usual and well known manner to provide a plurality ofspaced cylindrical suction holes or per-" forations 2 with the regularlace-like indented'intervening portion 3 shown, on enlarged scale, inFig. 3. The drilling may be done by any usual and well known machinesand methods now so generally used in the art. The wall 1 may be eithercylindrical, as in a roll, or fiat as in a box, both constructions beingwell known in the paper making industry. The operations thus completed,produce the construction disclosed in Figs. 1-3 and well known prior tothis invention. Of course, the holes may be drilled in various otherpositions, relatively to each other, than those illustrated. That is amere matter of selection. Adjustment and regulation of the devices foroperating the shell or plate, or of those for operating the feed of thedrills, in one direction or the other,

relatively to said shell or plate, during the drilling operations, willbe greatly controlling factors in positioning of the perforationsrelatively to each other. There are many well known types of suchregulating and controlling devices, many of them more or less automatic.It is not thought that illustration of any of them will add in any wayto a clearer understanding of the present invention. Accordingly none ofthem is illustrated in the drawings.

When the holes have been drilled, they are then counterbored,circularly, intheir outer ends, as in Fig. 1a, reducing considerably theimperforate area between perforations shown in Fig. 4 and providing aninclined or beveled countersunk wall 4 substantially'concentric with therespective erforation or bore. counter bores is such that the materialbetween the nearest points of the circumferences of. adjacentcounterbores is just sufficient to provide the necessary cross sectionalwidth of the supporting bars which are completed by the next succeedingstep. The preliminary circular countersink thus provided is thencompleted by re-shaping with a non-circular countersinking punch, stamp,or other suitable means of any desired construction. When a square isused, for instance, the width of the square will equal the greatestdiameter of the circular counter- The diameter of t ese sink. Onreference to Figs. 1a and 4 it will u excess metal-from the area of thefinal square tions as shown.

' forming the square. This final s uare countersink is then machined,polishe or otherwise smoothed to its final or finished condition. Thesame general idea is involved and. the same general operations are usedin each of the other forms of non-circular countersinks hereindisclosed, as will be readily understood. A slight variation of thefirst step of countersinking could be resorted to in the originalformation of the perforations. Instead of forming them as truecylindrical bores, ,theycould be formedas frusto-conical, with thelarger base at the endcorr'esponding to that in which I have shown thecircu lar countersink.-the outerend. In that case, the larger end of thetapered bore should be of the same diameter as that of the circularcountersink I have shown and the perforations should have the samerelative posi- In that case these larger ends would be punched inexactly the same ,way as described for unehing of the squarecountersinks. The difierence would be in the resulting inclinedcountersunk wall. In this instance, there would be only the fourtriangular inclined areas disposed equi-distant about the center of theperforation, whereas, in the form in which there is firsta circularcountersink, the final countersink is a continuous inclined surface ofsquare outline with the hole of the perforation as its center. Suchmodified constructionis illustratedin fragmentar plan view and inenlarged cross section in igs. 11 and 12.

Every countersink'lmade by any of the i I non-circular countersinks maybe used and above methods, radiates from the center of its respectivebore 2. In this way, the effective suction area of each bore isincreased by the difference between this greatest C11- cular crosssectional area and the area' within the outer edge of its enclosincountersink.

Thus the adjacent countersin s extend the total efi'ective suction areato include all otherwise waste space lying between the ends of the oldcylindrical perforations, leaving only a fine continuous rib-like wall.5 between adjacent countersinks, as 1n Fig. 6, roviding a completenetwork of bar surface orthe uniform support of the ulp carrying medium.In this. way the e ective suction area is greatly enlarged-that of eacherforation radiating to the full area of 1ts respective surroundingcountersink. The increased effective area distributes the operativeeffect of the vacuum much more uniformly because much more completely,leaving only the very small areas of the internarrow or thinrib-likerwalls 5 between the countersinks provide uniform and adequatesupport for the forming or-pulp supporting medium, yet do not involveunnecessary 'waste of surface for that purpose.

ent, is:

out vacuum effect. The

They

provide only the surface essential to anade uate and uniform support ofthe wire,

or like medium, :with the least possible decrease 1n eflectwe suctionarea, while main taining sufficient contact to prevent leakage or lossof suction and to avoid sagging of the surface.

In the preferred form, Figs. 4-6, a square countersink is shown, thesquares being arranged diagonally, relatively to each other, in the samecircumferential or perpendicular row or plane, i. e. corner-to-cornerinsuch rows. Likewise, they are arranged side-to-side or parallel,relatively to each other in the rows running spirally of the. roll ordia onally of the plate.

In Fig.% the square form of-countersink is arranged so that those inalternate longitudinal rows are in the same circumferentlal plane, thoseof one longltudlnal row falling opposite the spacesbet'ween those of therows on either side-a staggered construction,

In Fig. 8 each countersink is of diamond shape.

In Fig. 9 the counter-sinks are equilateral triangles grouped to formhexagons, which, of course, may be grouped asthe cells of a honeycomb;

In Fig. 10 hexagonal countersinks are. shown. V

In Fig. 11 is a view similar to Fig. .4, showing amodification withfrusto-conical bore; and

I Fig. 12is a cross section on line 12-12 of Fig. 11. It is obvious thatmany other forms.of

the cylindrical perforations or the net-like web or bar lyin between thecountersinks.

Having descri ed my invention, what I claim and desire to protect byLetters Pat- 1. In a rigid cylindrical suction element,

a wire supporting wall provided with a plurality of circular,perforations throughout the greater part of its surface said per.-forations having surrounding outwardly inclined countersunksurfaces'bounded at their figuration closely abutting one another on allsides'and collectively presenting a netouter edges by perimeters ofangular conlike wire su portingsurface'carried by said element an lyingbetween and filling the spaces between the countersunk outer ends of allsaid perforations, the aforesaid 5 countersunk areas greatly increasingthe effective suction area of said element without appreciably weakeninthe same.

2. In a rigid 'cylin rical suction element,

I a a wire supporting wall provided with a plurality of circularperforations throu hout the greater part ofits surface, each 0 saidperforations having a surrounding enlargement at its outer end openingthrough the outer surface of said element and bounded by erimeters ofangular configuration, the said perforations and enlargements closelyadjoining one another on all sides with adjacent boundary faces openingthrough the surface of the element to provide relatively 201 limitedseparating spaces on the outer surface of the suction element defined byparallel lines, whereby the effective area of said suction element isgreatly increased with out objectionably' weakening the said element anda net-like wire supportin surface is provided by the interconnectelimited spaces lying between the outer enlarged ends of the saidperforations.

In testimony whereof I have afiixed mysignature.

WILLIAM H. MILLSP'AUGH.

